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ITEM NO. #
46826

Black Compostable Mailer (Medium) 255mm x 325mm (100 per pack) – 100% Compostable

255mm x 325mm
In Stock - Ready for Despatch
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Signet’s Compostable Mailers are the ultimate eco-friendly alternative to regular plastic mailer bags.

Made from cornstarch and other compostable materials, our Compostable Mailers are certified industrial and home compostable to Australian standards, meaning they will breakdown and leave nothing behind. Signet's Compostable Mailers come in four sizes to suit products of any shapes and sizes. To dispose, simply remove any non eco-friendly baggage, such as the adhesive strip, shipping labels, and plastic tape, cut into strips, and place into your compost heap for the ultimate worm snack. In a commercial composting environment, Signet’s Compostable Mailers will breakdown within 90 days. While at home, it may take up to 180 days. Signet’s Compostable Mailers help eCommerce retailers, Adorn Cosmetics and Poppy and Daisy, sustainably send their orders and eliminate plastic waste from their packaging process.

Main Benefits:

Example Email
  • Our compostable mailers are a great environmentally friendly alternative to regular poly mailers
  • Made from plant-based materials, our mailers are certified to compost in industrial facilities and home composting environments, turning into organic fertiliser
  • Premium matte mailer provides both security and an enhanced unboxing experience for your customer!
  • Waterproof to keep products safe from rain and the elements
  • Double adhesive strip for easy re-use

How much do you charge for freight?

Free delivery for all orders over $110 inc GST is available to metropolitan customers; if an order is under $110* an $10.45* freight charge will apply. Low-cost delivery is available for all regional customers, with freight pricing calculated as part of the online shopping process. Please note that freight charges will vary for regional deliveries, as the cost is calculated upon the weight of each order.

How long will my delivery take?

Same day despatch is available for in-stock products ordered before 3pm.*
We're proud of our track record, which has seen 95% of deliveries to most metropolitan areas made in just one day.

Metropolitan Area

Brisbane, Sydney, Melbourne, Perth*
1-2 Business Days

Adelaide
2-3 Business Days

Regional Area

Queensland, New South Wales, ACT, Victoria, South Australia, Western Australia*
2-3 Business Days

Northern Territory
5-6 Business Days

Tasmania
5-7 Business Days


*Refers to Inc GST pricing

*For sourced on request products such as machinery and equipment, same-day despatch is not available. Please note that there will be a lead time for these products, subject to product availability.

*There may be a $20.60 charge for orders containing large or bulky items (excluding GST). These items may also take longer to transport. This charge does not include Machinery Equipment.

*To our Western Australia customers: in our ongoing endeavour to ensure that we are always in stock of your requested items, please note there may be a 5-6 day lead time in the event that we send your order from our warehouses on the Eastern Seaboard.

What is Signet's Compostable Mailers made from?

Signet's Compostable Mailers are made from cornstarch and 100% biodegradable plant-based materials, so have no trouble breaking down in either your home compost bin or a commercial composting facility.

How does the Compostable Mailer Bags work?

Pick a size that is suitable for your package, place the product inside the Compostable Mailer, remove the paper adhesive cover, and seal. The mailer is ready to send.

What sizes do you have of the Compostable Mailer Bags?

  • Small mailer: 165mm X 235mm
  • Medium mailer: 255mm x 325mm
  • Large size mailer: 395mm x 455mm
  • XLarge mailer: 420mm x 594mm

How do I compost the Compostable Mailer Bags?

Signet's Compostable Mailers are certified to Australian home and industrial composting standards. This means they will completely breakdown into organic fertiliser within 90 days in a commercial composting facility and 180 days in a home composting environment. Simply cut the bag into strips before composting as this will ease the process. If you don’t have a home compost, you can use a visit Sharewaste to find a composting facility near you.

How do our mailer bags line up to the Australia Post sizes?

Australia Post mailers come in the following sizes:

  • 500g - 220x355mm
  • 1kg - 265x385mm
  • 3kg - 310x405mm
  • 5kg - 435x510mm


If you are looking for a Compostable Mailer Bag closest to these sizes we recommend the following:

  • 500g- Use our small size mailer (165mm X 235mm)
  • 1kg - Use our medium size mailer (255mm x 325mm)
  • 3kg - Use our large size mailer (395mm x 455mm)
  • 5kg - Use our xlarge size mailer (420mm x 594mm)

What is the shelf life of a Compostable Mailer Bag?

Compostable Mailers are not made to last forever - the average shelf life is approx. 10-12 months. When storing, keep the mailer bags sealed and away from water, humidity, extreme temperatures, and sunlight.